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Install SQL Server 2005 Client or SQL Server 2008 Client on application server

Our application server is Windows 2008 R2, our database server is SQL Server 2005 right now and will be migrated to SQL 2008 next year. On this application server, do you have any suggestion for the SQL Client install - SQL 2005 Client or SQL 2008 Client? Why?
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I don't think you need to install client tools on application servers unless you have the app using client tools files...